Here's a neat behind-the-scenes glimpse at Glassbox, the engine powering EA's upcoming SimCity, the fifth game in developer Maxis's popular sim series.

Developer Dan Moskowitz gives us an official look (we saw the unofficial one a few weeks ago) at the map layers, agents, zones, and other insidey functionality that will make the game flow. Since SimCity will ship with a complete world builder that players can use to construct their own sandboxes, this is a great chance to start planning out your life-sized metropolitan re-creation of Stephen Totilo.